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Meaning of "SPACE"
    We introduce a space to represent a geometrical form as 
a part of the space.  We draw a geometrical form in a space, 
in other words, embed a geometrical form in a space.  This 
is the way of using a space.
    Why a picture instead of the original?  Because it becomes
easier to compute.  (If this were not the case, we should
not have introduced the space.)